A bike helmet only protects when it fits. Forget age labels — measure the head and match the size. Use the finder below, then grab our printable 5-step "learn to ride" guide for the fridge.
Kids Helmet Size Finder
A helmet only protects if it fits. Measure your child's head and find the right size — fit matters far more than age.
Free tool by Gear Force — kids' bikes, balance bikes & ride-ons, Australia-wide.
🚲 Learn to Ride a Bike in 5 Steps
A simple, balance-first method that works for most kids — printable to stick on the fridge.
- Get the gear right. A correctly sized bike (feet reach the ground) and a snug helmet sitting two fingers above the eyebrows, straps in a "V" under each ear. Pick flat, smooth ground — grass is forgiving for falls.
- Take the pedals off (or use a balance bike). Lower the seat so both feet sit flat. Let them walk the bike while seated to get comfortable holding it up themselves.
- Master the glide. Have them push along and lift both feet — gliding a little further each time. This is the real skill: balance and steering. Don't hold the bike; steady their shoulders if needed.
- Add the pedals back. Start with a scoot to get rolling, then place feet on the pedals and push. Keep eyes up and looking ahead, not down at the feet.
- Practise stopping & turning. Teach the brakes first (squeeze gently, don't grab), then gentle turns by looking where they want to go. Celebrate every win — confidence is everything.
Kids helmet size chart (by head circumference)
| Size | Head circumference | Age guide |
|---|---|---|
| XS / Toddler | 44–48 cm | ~1–3 yrs |
| Small | 48–52 cm | ~3–5 yrs |
| Small–Medium (Youth) | 52–55 cm | ~5–8 yrs |
| Medium | 55–58 cm | ~8–12 yrs |
| Large | 58–61 cm | ~12+ / teen |
How to measure & the 2-finger fit check
Wrap a soft tape around the widest part of the head, ~2 cm above the eyebrows; keep it level. A good fit sits level (two fingers above the brows), straps form a "V" under each ear, and it shouldn't rock or slip. In Australia look for AS/NZS 2063 certification; replace any helmet after a crash.
Learn to ride a bike in 5 steps
1. Get the gear right (fitted helmet + correct-size bike). 2. Take the pedals off (or use a balance bike). 3. Master the glide. 4. Add pedals back. 5. Practise stopping & turning. (The printable version is in the tool above.)
FAQ
Should I size up so it lasts? No — a loose helmet won't protect. Fit now; many have a dial to fine-tune.
Fastest way to teach riding? Balance first (pedals off / balance bike), then add pedals.
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<iframe src="https://gearforce.com.au/blogs/kids-bikes/kids-helmet-size-finder?embed=1" title="Kids Helmet Size Finder by Gear Force" style="width:100%;max-width:660px;height:900px;border:0;overflow:hidden" loading="lazy"></iframe>
<p>Powered by the <a href="https://gearforce.com.au/blogs/kids-bikes/kids-helmet-size-finder">Kids Helmet Size Finder</a> from <a href="https://gearforce.com.au/">Gear Force</a>.</p>More free Gear Force tools
- Kids Bike Size Calculator
- Balance Bike Readiness Checker
- Hoverboard Suitability Checker
- Kids Ride-On Car Selector
- Kids Helmet Size Finder + Learn to Ride
Gear Force is an Australian specialist in kids' bikes, balance bikes, ride-on cars and hoverboards, shipping nationwide from Melbourne. Our guidance is based on the geometry of the products we actually stock and years of helping families fit first-time riders.
